Water heater vibrates excessively or rattles during operation.

Safety: Turn off power before tightening any internal screws.

• 1. Check wall mounting: Ensure the Ferroli heater is firmly fixed to the wall and that all mounting brackets are tight.
• 2. Tighten covers: Tighten screws on the front cover and any internal panels that may be vibrating.
• 3. Inspect fan: If vibration coincides with fan operation, the fan may be imbalanced or worn and should be replaced.
• 4. Secure flue: Make sure the flue is properly supported and not rattling against structures.